High-speed boat.



J. H. BRANTH. HIGH SPEED BAT.

APPLICATION FILED MAB.11, 1909.

' 961,751), Patented June 21,1910.

2 SHEETS-SHEET 1.

J. H. BRANTH.y

HIGH SPEED BOAT.

lMPLIUATIQN FILED MAR-11, 1909.

2 SHEETS-SHEET 2,

"" ,arrofmhsrsL Patented June 21, 1910.

- his class with means lowing specification,

JOHN H. BRANTH, 0F NEW YORK, N. Y.

HIGH-SPEED Boer.

Specification of Letters Patent.

Patented J une 2i, 1910.

Application filed March 1.1, 1909. I Serial No. 482,804.

To all whom 'it may concern:

Be it known that I, JOHN H. BRANTH, a citizen of the United States, and residing at New York, in the county of New York and State of New York, have invented certain new and useful Speed Boats, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to'high speed boats, and particularly to what are known as hydro-plane boats; and the object thereof is to provide a boat of this class which is so formed and constructed asto prevent the lifting of the bow and depression or squatting of the stern when under highspeed; i further object beingto provide a boat of for supplying beneath the bottom thereof a film of air which passes backwardly beneath the bottom of' the boat,l

and which operates to reduce friction and prevent the suction'or the tendency to form a vacuum under the boat which results in the squatting of the stern portion of the boat when under high speedyand with these and other objects in view the inventionconsists in a boat of the class specified constructed as hereinafter described and fully disclosed in the folof which ,the accompanying drawings forin a part, in which the The invention is separate parts of my improvement are designated by suitable referencel characters in each of theviews, and in which- Figure l is a plan view of my improved boat, Fig. 21a bottom plan view thereof, Fig. 3 a transverse section o n the line 3-3 of Fig. l, Fig. 4 a longitudinal section on the line L -4.- of Fig. 1, Fig. ,5 a longitudinal section on the line 5-5 of Fig. 1, and ;-Fig. 6 a stern view.

In the practice of my Y a hull a which is of the general forln lshown in the drawings, said hull being approximately rectangular in cross section andcomprising a bottom a2, a deck a3 and sides a4. The sides a4 of the hull are parallel and the invention, I provide bow thereof -is curved upwardly as shown' at a5, and in the central and rear portion of thehull is the usual c ock-pit a provided with a shield aT which l'ncloses the bow end of the cock-pit and the sides and rear thereof.

The transverse width of the opening into Improvements in Highof the cock-pit is placed i raised portion g3 which wardly,

the cock-pit is preferably less than the transverse width of the hull as shown in Fig. l, and the front or bow end of the shield a7 of the cock-pit is curved and flared as shown, and the sides thereof are parallel or substantially so.

The sides a* of the hull are provided throughout theirfull lengths with downwardly directed side keel-hns b which are ytapered to correspond with the taper of the bow and which, from a predetermined point,

preferably slightly rearwardly ofthe longitudinal center of the hull as'shownat b2, are tapered downwardly and backwardly -as shown at`b. ,Y i

Secured longitudinally of the lbottom' a2 of thehull and equally spaced transversely thereof are supplemental longitudinal keelins o which extend from a predetemined point beneath the bow portion of the boat backwardly and are projected beyond the side keels b as shown at 02 in.Fig. 2, the rear end portions 'of the side keels being at b4.

lVithin the lfront end or bow end portion a motor or engine d with which the propeller shaft e is connected in the usual manner, and said propeller shaft passes downwardly and'backwardly through a longitudinally arranged opening a8 in the bottom a2 of the hull, and the rear end portion of the propeller shaft e is provided with a support and bearing e2 through which it passes and which is mounted between the rear end portions of the supplemental keelfins o, and the propeller o3 with which the shaft o provided isbetween the rear end extensions o2 of thev supplemental keel-fins o, and the bottom of the hull extends backwardly thereover and covers the propeller.

The opening as in the bottom a2 of the hull (t through which the propeller shaft e passes is inclosed by a longitudinally arranged hood which is secured to the bottom a2 and at the front end of which is a stuffing box g through which the propeller' shaft passes.

rlhe hood g is provided centrally witha slants forwardly and which ,is provided at the top with a sliding door g4 which is adapted to open backand in the rear portion of the cockpit a and betweenthe side. keel-fins Z) and the `supplement-all kee -ins o, the bottom a2. of the hull lis provided -,with openings h. which are inclosed lby hoods i secured to the bottonra' of thehull which slant forwardly,

- and g are extended upwar and in the top portions of which are placed sliding doors i2 adapted to open backwardly. The hoods z' and the part da of the hoods c' y to or approximately to the top of the hull, and the doors of said hoods or members maybe operated by hand or by any suitable mechanical devices. l

Mounted at the stern of the hull and at each side thereof is a rudder 7' rovi'ded with supports .'7'2 and ja secured to t e top of the sides of the hull and to the bottom of the side keel-fins b, and pivoted to the top of these rudders and near the outer edge thereof is a transverse bar jt, and pivoted centrally of the stern of the hull as shown at j* is a tiller arm je adapted to swing in a horizontal plane and provided at its rear end with a fork y through which passes a pin js connected with the bar y'4 and by means of this construction the ru ders j ma be swung in either direction by means of the tiller arm jc.

The side keelfins b and the supplemental keel-fins c form side channels k, and a middle channel 7a2 longitudinally of the bottom of the hull and through which, when the boat is under high speed, the air rushes, this operation being facilitated by the shape of the bow or the bottom a2 lthereof in transverse section, and by the upwardly directed slant or curve given thereto.

When the'boat has reached a comparatively high rate of speed, the doors g4 and 2 are opened and air rushes down through the openings a and 7L in the bottomu,2 of

the hull and passes back through the rear ends of the channels 7c and 7a2, and this passage of air backwardly through the channe s 7c and k2 from these openings prevents,

- to an extent, the lifting or elevation of the ting bow when the boat is under high speed and the squatting or depression of the stern of the boat.

In boats of this class as usually constructed, there is a tendency under high speed to produce a vacuum under the hull and especially the stern portion thereof, and this causes the lifting lof the bow and the squatof the stern; but with my improvement the air which rushes -in through the 'openings 71, and a8, said movement of the air being occasioned by thehigh speed of the boat, prevents this tendency toY form a vacuum and there is a film of -air between the bottom a2 of the hull and thewater, and this reduces friction to a large extent and lignaterially aids, or adds to the speed of the oat.

My invention is not limited to the shape of the bottom edges -of the side keel-fins b as herein shown and described, and said side keel-fins may be tapered in any desired manner, or may be of the same width throughout, and this is also true of the supplemental keel-tins o. I I also 1preferably secure to the bottom of the hu and longitudinally of the channels lc and through said air holes and to force the same to pass backwardly when the boat is in inotion, and it will be understood that the side keel-fins b and supplemental keel-fins c not only serve to form channels for the backward passage of the air beneath the hull of the boat, but they also aid in Guiding or ,steering the boat, and the said side `keel-fins causes the propeller tooperate with greaterl force or power o n water passing through said channel than it would have when operating in the open, or rearwardly of the boat in the usual manner.

By means of my improved construction, I

provide a boat of the class specified which Y will ride level when under high pressure or under high speed, and which can'be easily steered or guided, and byvmeans of the construction of which a maximum speed may be obtained with a minimum power, and my invention is not limited to the exact details of construction herein shown and described; and various changes therein and modificaat the oppof site sides of the air holes or. openings IL longitudinally ranging shield tins k2, the object V ofv which is to control the air which passes tionst'hereof may be made, within the scope of the appended claims, without departing from the spirit of my invention or sacricing its' advantages.

The forwardly directedv slant of the hoods z' and the top portion g3 of the hood g facilitates the 4downward and backward movement of the air through the bottom of the hull as hereinbefore described, and in practice this inrush -of air which, when the boat is under high speed, Will be great, may be regulated or controlled by the\movement of the doors 2 and yt, and any suitable means may be provided as'hereinbefore stated for operating said doors.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. boat of the class described comprising a hull the bottom of which is approximately horizontal in cross section and the bow of which is Aupwardly curved, the bottom of the hull being also provided at the `opposite sides thereof with longitudinally ranging and downwardly directed side keelns between which are placed longitudinal supplemental keel-fins, said boat being also provided with a' cock-pit in the front end 130 `the cock-pit.

portion Aof which the motor is placed, a propeller 'shaft connected with said motor and passing downwardly and backwardly through the bottom of the hull and between the supplemental keel-tins and provided at its rear end with a propeller.

2. A boat of the class described comprising a hull the bottom of which is approximately horizontal in cross section and the bow of which is upwardly curved, the bottom of the hull being also provided at the opposite sides thereof with longitudinally ranging and downwardly directed side keelfins between which are placed longitudinal supplemental keel-fins, said boat being also provided with a cock-pit in the front end.

portion of which the motor is placed, a propeller shaft connected with said motor and assing downwardly and backwardly through the bottom of the hull and between the supplemental keel-fins and provided at its rear end with a propeller, the side portio11s'ofthe bottoni of the hull being also provided with air holes, and means for opening and closing the same.

3. A boat of the class described comprisying a hull the bottom of which is substantially horizontal in cross section and the bow of which is curved upwardly, the side portions of the hull being provided with longitudinally ranging downwardly directed keel-fins, and means for propelling the boat comprising a motor mounted therein, a propeller shaft connected therewith and passing downwardly and backwardly through the bottom of the hull of the boat and provided at its rear end with a propeller, the opening in the bottom of the hull through which the propeller shaft passes being inclosed by a hood which extends upwardly and forwardly to or approximately to the top of the hull.

4. A boat of the class described comprising a hull having the usual cock-pit, the bow of the hull being curved upwardly and the bottom thereof being substantially horizont-al in cross section, said hull being also provided at the sides thereof withl longitudinally arranged and downwardly di` rected side keel ns, between which are placed equally spaced supplei'nental keeltins, and means for propelling the boat, the bottom of the hull being provided'between said tins with air openings which are 'inclosed by hoods which extend upwardly in 5. A boat of the class described comprising a hull having the usual cock-pit, the bow of the hull being curved upwardly and the bottom thereof being substantially horizontal in cross section, said hull being also provided at the opposite sides4 with lon itudinally arranged and downwardly rected side keel-fins between which are" placed equally spaced supplemental keelfins, a motor placed between the cock-pit, a propeller shaft connected with said motor and extending downwardly and backwardly through the bottom of the hull between the supplemental keel-fins, the opening in the hull through which the propeller shaft passes. being inclosed by a hood or casing which extends upwardly in the cock-pit and opens upwardly, and the bottom of the hull being also provided between the side fins and the supplemental nswith openings closed by hoods which open upwardly in the cockait.

1 6. A boat of the class described comprising a hull, the bottomof which is substana tially horizontal in'cross section and the bow of which is curved upwardly, said hull being also provided with the usual cock-pit, the side portions of the hull being provided with longitudinally ranging downwardly directed keel-tins, and the bottom of the hull vbein also provided centrally thereof with longitudinally ranging supplemental keeltins, a motor placed in the cock-pit of the boat, a propeller shaft connected with said' motor and extending downwardly and backwardly through the bottom of the hull and between the supplemental keel-fins and provided at its rear end with a propeller, said p ropeller being provided with side guards and a top cover or shield, the opening in the hull, through which the propeller shaft passes being closed by a hood or casing which extends upwardly in the cock-pit and opens upwardly and the bottom of the hull being provided between the side fins and the supplemental tins with openings closed by hoods which open upwardly in the cock-pit.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 10th day of March 1909.

H. R. CANFIELD, C. E. MUnREANY. 

